11 July 2018 The calibration unit of the mid-infrared E-ELT instrument METIS
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Abstract
We present the preliminary design of the calibration unit of the future E-ELT instrument METIS. This independent subunit is mounted externally to the main cryostat of METIS and will function both as calibration reference for science observations, as well as verification and alignment tool during the AIT phase. In this paper, we focus on describing its preliminary layout and foreseen functionalities, based on the performance requirements defined at system level and the constraints imposed by warm IR background. We discuss the advantage of employing an integrating sphere as common radiation emitter, leading to a novel and versatile design, where the source’s spatio-spectral properties can be varied with high fidelity and repeatability. By combining only few tuneable sources and mechanisms we show how a large instrument such as METIS can be calibrated and tested, without the need of a complex cold calibration unit.
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Nicola Baccichet, Nicola Baccichet, Lucas Labadie, Lucas Labadie, Steffen Rost, Steffen Rost, Christian Straubmeier, Christian Straubmeier, Michael Wiest, Michael Wiest, Leonard Burtscher, Leonard Burtscher, Tibor Agócs, Tibor Agócs, Willem Jellema, Willem Jellema, Ronald Roelfsema, Ronald Roelfsema, Roy van Boekel, Roy van Boekel, Adrian Glauser, Adrian Glauser, Bernhard Brandl, Bernhard Brandl, Felix Bettonvil, Felix Bettonvil, Jeff Lynn, Jeff Lynn, Andreas Eckart, Andreas Eckart, "The calibration unit of the mid-infrared E-ELT instrument METIS", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070291 (11 July 2018); doi: 10.1117/12.2312075; https://doi.org/10.1117/12.2312075
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